21975444640416 has 48 divisors (see below), whose sum is σ = 57721983225984. Its totient is φ = 7320520779264.

The previous prime is 21975444640337. The next prime is 21975444640427. The reversal of 21975444640416 is 61404644457912.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72150901 + ... + 72454836.

It is an arithmetic number, because the mean of its divisors is an integer number (1202541317208).

Almost surely, 2^{21975444640416} is an apocalyptic number.

It is an amenable number.

21975444640416 is an abundant number, since it is smaller than the sum of its proper divisors (35746538585568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21975444640416 is a wasteful number, since it uses less digits than its factorization.

21975444640416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144607333 (or 144607325 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 57.

The spelling of 21975444640416 in words is "twenty-one trillion, nine hundred seventy-five billion, four hundred forty-four million, six hundred forty thousand, four hundred sixteen".